Acoustic device



Oct. 14, 1930. G. w. BURCHETT ACOUSTIC DEVICE Filed Feb. 5, 1924 d d/yePatented Oct. 14, 1930 1 UNITED STATES GEORGE W. BURC'HETT, F PEEKSKILL,NEW YORK, ASSIGNOR T0 WESTERN ELECTRIC CQMPANY, INCORPORATED, OF NEWYORK, N. A COEEORATION OF NEW YORK ACOUSTIC DEVICE Application filedFebruary 5, 192. Serial No. 690,803.

sound radiating members.

tion;

In general, this invention comprises a frusto-conical section attachedto the base of the conical diaphragm and rigidly supported at itssmaller diameter.

This invention can be clearly understood from a consideration of thefollowing detailed description in connection with the drawing in which:Fig. 1 is a rear View of a loud s eaking receiver employing thisinvenig. 2 is a side elevation of the device shown in Fig. 1; andFig. 3is a detailed section of the diaphragm and frusto-conical support.

The diaphragm 5 is conical in shape and as made of some light elasticmaterial such as paper. Attached to its base is a frusto-conicalsupporting member 6 preferably made of the same material as thediaphragm 5. The'irusto-conical .member 6 serves as a support for themember 5 and cooperates with it in reproducing the sound vibrations.

The conical and frusto-conical sections are fastened together at theirouter edges, preferably by means of an aluminum ring 7 of tl-shapedcross section clamped around the two sections as is shown in detailinFig. 3. This ring not only serves as a simple and efficient ineans ofclamping the two sections together and stiffening their edges but alsoprovides mechanical protection for the diaphragm. Another ring of metal8 is clamped around the edge of the'frusto-conical section at itssmaller diameter. this section and to provide means of mountmg.

lihe diaphragm is supported by a stand 9 on which is mounted a castmetal ring 10.

'The frusto-conical section is securely attached to this supporting ringby means of bolts 11. In order to prevent chattering, the metal ring 8is kept out of contact with the supporting ring 10 throughout the majorpart of its circumference and in the form of this inventiQn shown, thisis accomplished This serves to stifi'en llolylmeans of bosses 15provided at each bolt- Attached to the supporting ring 10 is a bracket12 on which is mounted an actuating device 13 which transmits vibrationsto the diaphragm through a rod 14 attached to the diaphragm at its apex.This actuating device may be any of the well-known electromagnetic typesbut is preferably of the type described in U. S. Patent No. 1,365,898granted to H. .C. Edgerton January 18, 1921.

This invention has been described in connection with a loud speakingreceiver but it should be understood that it is readily applicable toother devices such as phonographreproducers' or recorders bysubstituting actuating devices which are well known in the. the art.

What is claimed is:

1. An acoustic device comprising a conical diaphragm, driving meansattached to the apex thereof, a frusto-conical support having one edgeattached to said diaphragm and means for rigidly supporting said frustoconical support at its outer edge.'

2. An acoustic device comprising a conical diaphragm, a frusto-conicalsupport having its base attached to thebase of said diaphragm anda rigidring securely fastened to the frusto-conical support at its smaller end.

. 3. An acoustic device comprising a conical diaphragm, a frusto-conicalsupport having its outer edge attached to the'base of said diaphragm, ametal ring clamped around the inner edge of said frusto-conical supportand a rigid rin firmly attached to said frusto-conical support at itsinner edge.

l. An acoustic device comprising'a conical diaphragm, a frusto-conicalsupport for said diaphragm, means for clamping together the bases ofsaid conical diaphragm and said frusto-conical support and means forrigidly supporting said frusto-conical support.

5. An acoustic device comprising a conical diaphragm, a frusto-conicalsupport for said diaphragm, a metal ring clamping together the edges ofthe bases of said diaphragm and said frusto-conical support and a baserigidly attached to the smaller end of said frustoconical support. I

6.- An acoustic device comprising a conical diaphragm,a frusto-conicalsection made of material of substantially the same mechanical propertiesas said diaphragm, means for fastening together the bases of saidconical diaphragm and said frusto-conical section, a metal ring clampedaround the edgeof said frusto-conical section at its smaller end, anannular support for said diaphragm rigidly attached to said metal ringand means for preventing the edge of said .frusto-conical section fromchattering.

7. An acoustic device comprising a conical diaphragm, a frusto-conicalsupport attached to said diaphragm at its base, a metal ring clamp'ed tothe edge of the smaller end of. said frusto-conical support, an annularsupport firmly attached to the smaller end. of Said frusto-conicalsupport at a plurality of points and means for preventing said metalring from coming in contact with said annu-' lar support at points otherthan said points of attachment.

8. An acoustic device comprising a conical diaphragm, a frusto-conicalsupport for said diaphragm, a metal ringclamping together the edges ofthe bases of said conical diaphra m and said frusto-conical support, ametal ring clamped to the edge of the smaller end of said frusto-conicalsupport, an annular support firmly attached to the smaller end of saidirusto-conical support at a plurality of points and bosses on saidannular support for preventing said metal ring from coming-in contactwith said annular'support at points other than said points ofattachment.

9. An acoustic device comprising a conical diaphragm of fibrousmaterial, a section of fibrous material for supporting said diaphragmand a metal band clamped on the edge of said diaphragm at the point. ofattachment to said supporting section.

10. An acoustic devic comprising a conical diaphragm, a. frusto-conicalsupport for said diaphragm, and a U shaped ring of aluminum clampingtogether the edges of the bases of. said conical diaphragm and saidfrustoconical support. I

I 11. An acoustic device comprising a conical diaphragm, afrusto-conical support having its base attached to the base of saidconical diaphragm, a rigid ring securly fastened to said frusto-conicalsupport at its smaller end, an actuating device having a vibratingmember attached to said conical diaphragm at its apex and a supportingmember attached to said rigid ring for supporting said actuating device.

12. An acoustic device comprising a conical diaphragm, a frusto-conicalsection having one edge attached to saidconical diaphragm, means forreinforcing the other edge of said frusto-conical section, and means forrigidly mounting said reinforced edge.

13. An acoustic device comprising a conical section, driving meansconnected to the apex thereof, a frustum shaped section arranged to haveits base attached to the base of said conical section, means forconnecting said sections at their bases, and a rigidmemher to which thesmaller end'of the frustumshaped section is attached, said member havingan opening therein through which air may pass.

14. An acoustic device comprising a conical diaphragm, a frustum shapedsupport for said diaphragm, means for securing together ical diaphragm,a fusto-conical section of material of mechanical properties similar tothose of said diaphragm, means for fastening together the bases of saidconical dia-- phragmand said frusto-conic'al section, means for rigidlysupporting the other edge of said frusto-conicai section, and means forreinforcing said last mentioned edge of said frusto conical section tofrom chattering.

-16. An acoustic device comprising a diaphragm, an. apertured supporthaving its edge attached to said diaphragm so as to form with saiddiaphragm a hollow body, means'for rigidly mounting said support at itsaperture, and means connected to said diaphragm for impartingvibrational forces to said diaphragm to move it toward and away fromsaid rigid mounting, said means being positioned Within said hollowbody.

17. Anacoustic device according'to claim 16 in which said aperturedsupport is composed of material of substantially the same mechanicalproperties as said diaphragm.

, 18. In a sound reproducer,a rigid ring support, a coneshaped diaphragmof greater edge diameter than said support, continuous, flexible sheetmaterial uniting the edge of said diaphragm to said support, and meansfor applying vibrations representing sound to said diaphragm.

19. A. sound producer; comprising light flexible material formed into afirst and a second surface of revolutiomsaid second surface ofrevolution having its edge united to the edge of said first surface ofrevolution, a rigid support member secured to the other edge'of saidsecond surface, and actuating means operatively connected to a point insaid firstsurfaoe.

20. In an acoustic device, a dish-shaped diaphragm, a dish-shapedsupport having an opening therein, a rigid member having a prevent saidedge masses configuration substantially the same as the openmg in saiddish-shaped member formounting said dish-shaped member thereon,

and means for fastening the peripheries of- 5 saiddiaphragm and saiddish-shaped memher together, said diaphragm and dishshaped memberforming an air chamber.

21. In an acoustical device,'a diaphragm, a flexible support securedthereto adjacent its periphery and combining therewith to form an airchamber, a centrally located ring' said opening so that all points ofsaid memher are free to vibrate except at said opening, said memberforming with said means a chamber for air, said means having anopeningtherein for the egress and ingress of air inresgonse to vibrationsimparted to said member y said driving device.

In witness whereof, I hereunto subscribe my name this 2 day of February,A. D, 1924:.

- GEORGE W. BURCHETT.

.csnr r ennior GGRREG'HQN;

- Patent as 3, 778,308.

Granted fictoherid, 1936, to

ca ories in anacmirr.

it is hereby certified an error appears in the printed specification oithe.

above numbered patent requiring correction as followsi Page 1, iine 75,claim 1, for "outer" read other; page 2, line 45, claim 10, tor themissneiied word "devic" read device; line 88, claim 15, for the compoundword "fnstoconicai" read; innate-conical; line-129, claim 20, for theword "support" read member, and line 130, for "member" read support; andthatthe said Letters Patent shouid be read with these correctionstherein that the same may conform to the record of the case inthe-Patent Office Signed and seated this-1st day of September A. Ba1931.

can

hi J. Moore,- Act-ing tflommissioner of Patents

